A joint publication with Helen Gomonay about magnetoelastic effects at the interface of antiferromagnetic-ferromagnetic bilayers has been published in Physical Review B.
They show that surface acoustic waves at the interface of both magnets can be used to find complex magnetic textures.They are able to connect the magnetoelastic resonance to spin spirals in both layers.The reulst add to the emergent research in using noncollinear magnetism in spintronics devices.
They show a theoretical mechanism to imprint spin chirality into collinear antiferromagnets with the use of laser pulses. These pulses then can lead to quasi-stable ciral states. The results provide a more detailed insight on the interactions between light and chiral magnetism.
A publication from the team of antiferromagnetic spintronics about giant and tunneling magnetoresistance in unconventional collinear antiferromagnets has been published in Physical Review X.
They presentc archetype model mechanisms for the giant and tunneling magnetoresistance effects in multilayers of such materials. These mechanisms are linked to real materials through ab-initio calculations. Further they show how their models can allow for magnetic excitations by teh spin transfer torque.
A joint publication from the team of antiferromagnetic spintronics about domain walls driven by elastic defects has been published in Nature Communications.
They show that the domain structure in thin films of the antiferromagnet CuMnAs is dominated by elastic defects. These defects determine the location and orientation of 90° and 180° domain walls.The results show the impact of defects on the antiferromagnetic domain structure and provides a route to optimize the performance of devices.
In more detail, they studied the antiferromagnet hematite with the Dzyaloshinskii-Moriya interaction (DMI). The results show that the DMI gives a new reconfigurability in the long distance magnon transport within thin films. This introduces a hysteresis in the system as a consequense of a competiotion of the Zeeman field and the effective field of the DMI.
They present a new theory based on the doped Hubbard model and the slave-boson formalism. The results of their work point towards possible new Hall physics thhat was previously unanticipated in the studied frustrated materials.
They present fundamentals on van der Waals magnetism and spin–orbit coupling effects in 2D systems. It is discussed how the coexistance of both effects could establish new ways to engineer robust spin textures. The results will help in designing future non-volatile memory devices that utilize the unique properties of 2D materials.
A joint publication by the Organic Spintronics Team showing how key spintronic properties of organic molecules adsorbed at a solid surface may be precisely tuned by modifying the adsorbate structure has been published in Physical Review Letters.
More precisely, experiments performed by our collaborators at Cambridge University (UK), show a broadening of the electron spin resonance (ESR) linewidth upon spin injection from a permalloy surface into thin films of DNTT-based organic molecules. This broadening depends sensitively on the composition and surface bonding of the adsorbate molecules.
With the support of theoretical calculations performed by collaborators at Mons University (BE), significant differences in, e.g., the spin diffusion lengths of the organic adsorbate layers can be inferred from the measured variations in ESR linewidth.
A publication by the Organic Spintronics Team (OST) revising the established method for calculation of molecular spin admixture parameters from first-principles electronic structure theory has been published in Physical Review B. Spin states in a semi-conductor or molecule are a mixture of up and down, because of spin-orbit coupling (SOC). Spin admixture is one of the main ways in which SOC influences the spin dynamics in a molecular material.
The revised method for calculating spin admixture improves on a number of approximations made in the previous method, resulting in greater accuracy and transferability. Still, this method relies on efficient, standard electronic structure theory only, making it easy to implement, and suitable for large-scale calculations.